Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, JUNOSe 11.1.X Configuration Manual
JUNOSe™ Software
for E Series™ Broadband Services Routers
Quality of Service Configuration Guide
Release 11.1.x
Juniper Networks, Inc.
1194 North Mathilda Avenue
Sunnyvale, California 94089
USA
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www.juniper.net
Published: 2010-03-21
Juniper Networks, the Juniper Networks logo, JUNOS, NetScreen, ScreenOS, and Steel-Belted Radius are registered trademarks of Juniper Networks, Inc. in
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Products made or sold by Juniper Networks or components thereof might be covered by one or more of the following patents that are owned by or licensed
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6,538,518, 6,538,899, 6,552,918, 6,567,902, 6,578,186, and 6,590,785.
JUNOSe™ Software for E Series™ Broadband Services Routers Quality of Service Configuration Guide
Release 11.1.x
Copyright © 2010, Juniper Networks, Inc.
All rights reserved. Printed in USA.
Writing: Krupa Chandrashekar, Bruce Gillham, Sarah Lesway-Ball, Brian Wesley Simmons, Poornima Goswami, Chander Aima
Editing: Benjamin Mann
Illustration: Nathaniel Woodward
Cover Design: Edmonds Design
Revision History
April 2010—FRS JUNOSe 11.1.x
The information in this document is current as of the date listed in the revision history.
YEAR 2000 NOTICE
Juniper Networks hardware and software products are Year 2000 compliant. The JUNOS Software has no known time-related limitations through the year
2038. However, the NTP application is known to have some difficulty in the year 2036.
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Abbreviated Table of Contents
About the Documentation xxix
Part 1 QoS on the E Series Router
Chapter 1 Quality of Service Overview 3
Part 2 Classifying, Queuing, and Dropping Traffic
Chapter 2 Defining Service Levels with Traffic Classes and Traffic-Class Groups 13
Chapter 3 Configuring Queue Profiles for Buffer Management 17
Chapter 4 Configuring Dropping Behavior with RED and WRED 25
Chapter 5 Gathering Statistics for Rates and Events in the Queue 37
Part 3 Scheduling and Shaping Traffic
Chapter 6 QoS Scheduler Hierarchy Overview 45
Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy 51
Chapter 8 Configuring Strict-Priority Scheduling 59
Chapter 9 Shared Shaping Overview 71
Chapter 10 Configuring Simple Shared Shaping of Traffic 79
Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm 89
Chapter 12 Configuring Compound Shared Shaping of Traffic 99
Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping 107
Chapter 14 Monitoring a QoS Scheduler Hierarchy 123
Part 4 Creating a QoS Scheduler Hierarchy on an Interface with
QoS Profiles
Chapter 15 QoS Profile Overview 127
Chapter 16 Configuring and Attaching QoS Profiles to an Interface 131
Chapter 17 Configuring Shadow Nodes for Queue Management 149
Chapter 18 Monitoring a Scheduler Hierarchy on an Interface with QoS Profiles 155
Part 5 Interface Solutions for QoS
Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM 159
Chapter 20 Configuring QoS for Gigabit Ethernet Interfaces and VLAN Subinterfaces 177
Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups 183
Abbreviated Table of Contents ■ vii
JUNOSe 11.1.x Quality of Service Configuration Guide
Chapter 22 Configuring QoS for L2TP Sessions 197
Chapter 23 Configuring Interface Sets for QoS 207
Part 6 Managing Queuing and Scheduling with QoS Parameters
Chapter 24 QoS Parameter Overview 225
Chapter 25 Configuring a QoS Parameter 229
Chapter 26 Configuring Hierarchical QoS Parameters 261
Chapter 27 Configuring IP Multicast Bandwidth Adjustment with QoS Parameters 269
Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters 281
Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS Parameters 293
Chapter 30 Configuring the Downstream Rate Using QoS Parameters 301
Part 7 Monitoring and Troubleshooting QoS
Chapter 31 Monitoring QoS on E Series Routers 313
Chapter 32 Troubleshooting QoS 357
Part 8 Index
Index 361
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Table of Contents
About the Documentation xxix
E Series and JUNOSe Documentation and Release Notes ............................xxix
Audience ....................................................................................................xxix
E Series and JUNOSe Text and Syntax Conventions ....................................xxix
Obtaining Documentation ..........................................................................xxxi
Documentation Feedback ...........................................................................xxxi
Requesting Technical Support .....................................................................xxxi
Self-Help Online Tools and Resources .................................................xxxii
Opening a Case with JTAC ...................................................................xxxii
Part 1 QoS on the E Series Router
Chapter 1 Quality of Service Overview 3
QoS on the E Series Router Overview ..............................................................3
QoS Audience ..................................................................................................4
QoS Platform Considerations ..........................................................................4
Interface Specifiers ...................................................................................5
QoS Terms ......................................................................................................5
QoS Features ...................................................................................................7
Configuring QoS on the E Series Router ..........................................................8
QoS References ...............................................................................................9
Part 2 Classifying, Queuing, and Dropping Traffic
Chapter 2 Defining Service Levels with Traffic Classes and Traffic-Class
Groups 13
Traffic Class and Traffic-Class Groups Overview ............................................13
Configuring Traffic Classes That Define Service Levels ..................................14
Configuring Traffic-Class Groups That Define Service Levels ..........................15
Monitoring Traffic Classes and Traffic-Class Groups for Defined Levels of
Best-Effort Forwarding ............................................................................13
Traffic-Class Groups Overview ................................................................14
Service ....................................................................................................16
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JUNOSe 11.1.x Quality of Service Configuration Guide
Chapter 3 Configuring Queue Profiles for Buffer Management 17
Queuing and Buffer Management Overview ..................................................17
Static Oversubscription ...........................................................................18
Dynamic Oversubscription .....................................................................18
Color-Based Thresholding .......................................................................18
Memory Requirements for Queue and Buffers ..............................................19
Guidelines for Managing Queue Thresholds ...................................................19
Guidelines for Configuring a Maximum Threshold ..................................19
Guidelines for Configuring a Minimum Threshold ...................................20
Guidelines for Managing Buffers ....................................................................20
Guidelines for Managing Buffer Starvation ..............................................21
Configuring Queue Profiles to Manage Buffers and Thresholds ......................22
Monitoring Queues and Buffers .....................................................................24
Chapter 4 Configuring Dropping Behavior with RED and WRED 25
Dropping Behavior Overview ........................................................................25
RED and WRED Overview .............................................................................26
Configuring RED ............................................................................................27
Example: Configuring Average Queue Length for RED ..................................28
Example: Configuring Dropping Thresholds for RED .....................................29
Example: Configuring Color-Blind RED ..........................................................29
Configuring WRED ........................................................................................31
Example: Configuring Different Treatment of Colored Packets for WRED .....33
Example: Defining Different Drop Behavior for Each Traffic Class for
WRED .....................................................................................................33
Example: Configuring WRED and Dynamic Queue Thresholds .....................34
Monitoring RED and WRED ..........................................................................36
Chapter 5 Gathering Statistics for Rates and Events in the Queue 37
QoS Statistics Overview .................................................................................37
Rate Statistics .........................................................................................38
Event Statistics ........................................................................................38
Bulk Statistics Support for QoS Statistics .................................................38
Configuring Statistic Profiles for QoS .............................................................39
Configuring Rate Statistics .............................................................................39
Configuring Event Statistics ...........................................................................40
Clearing QoS Statistics on the Egress Queue ..................................................41
Clearing QoS Statistics on the Fabric Queue ..................................................42
Monitoring QoS Statistics for Rates and Events .............................................42
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Table of Contents
Part 3 Scheduling and Shaping Traffic
Chapter 6 QoS Scheduler Hierarchy Overview 45
Scheduler Hierarchy Overview ......................................................................45
Shaping Rates, Assured Rates, and Relative Weights in a Scheduler
Hierarchy .........................................................................................46
Configuring a Scheduler Hierarchy ................................................................47
Configuring a Scheduler Profile for a Scheduler Node or Queue ....................48
Using Expressions for Bandwidth and Burst Values in a Scheduler Profile .....48
Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy 51
Rate Shaping and Port Shaping Overview .....................................................51
Configuring Rate Shaping for a Scheduler Node or Queue .............................52
Configuring Port Shaping ..............................................................................53
Static and Hierarchical Assured Rate Overview .............................................54
Configuring an Assured Rate for a Scheduler Node or Queue ........................55
Configuring a Static Assured Rate ...........................................................55
Configuring a Hierarchical Assured Rate .................................................56
Changing the Assured Rate to an HRR Weight ........................................56
Configuring the HRR Weight for a Scheduler Node or Queue ........................57
Chapter 8 Configuring Strict-Priority Scheduling 59
Strict-Priority and Relative Strict-Priority Scheduling Overview .....................59
Relative Strict-Priority Scheduling Overview ...........................................60
Comparison of True Strict Priority with Relative Strict Priority
Scheduling ..............................................................................................61
Schedulers and True Strict Priority ..........................................................61
Schedulers and Relative Strict Priority ....................................................62
Relative Strict Priority on ATM Modules ..................................................63
Oversubscribing ATM Ports ..............................................................64
Minimizing Latency on the SAR Scheduler .......................................64
HRR Scheduler Behavior and Strict-Priority Scheduling ...........................64
Zero-Weight Queues .........................................................................64
Setting the Burst Size in a Shaping Rate ...........................................65
Special Shaping Rate for Nonstrict Queues .......................................65
Configuring Strict-Priority Scheduling ............................................................66
Configuring Relative Strict-Priority Scheduling for Aggregate Shaping
Rates .......................................................................................................68
Chapter 9 Shared Shaping Overview 71
Shared Shaping Overview .............................................................................71
Shared Shaper Terms ....................................................................................72
How Shared Shaping Works ..........................................................................72
Active Constituents for Shared Shaping ..................................................73
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JUNOSe 11.1.x Quality of Service Configuration Guide
Guidelines for Configuring Simple and Compound Shared Shaping ...............74
Shared Shaping and Individual Shaping ..................................................74
Shared Shaping and Best-Effort Queues and Nodes ................................74
ATM and Shared Shaping ........................................................................75
Sharing Bandwidth with the SAR ......................................................75
Shared Shaping and Low-CDV Mode ................................................75
Logical Interface Traffic Carried in Other Queues ....................................76
Traffic Starvation and Shared Shaping ....................................................76
Oversubscription and Shared Shaping ....................................................77
Burst Size and Shared Shaping ................................................................77
Chapter 10 Configuring Simple Shared Shaping of Traffic 79
Simple Shared Shaping Overview ..................................................................79
Bandwidth Allocation for Simple Shared Shaping ...................................79
Simple Shared Shaping on the Best-Effort Scheduler Node .....................79
Simple Shared Shaping for Triple-Play Networks ....................................80
Configuring Simple Shared Shaping ..............................................................81
Example: Simple Shared Shaping for ATM VCs .............................................83
Example: Simple Shared Shaping for ATM VPs ..............................................85
Example: Simple Shared Shaping for Ethernet ..............................................86
Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm 89
Simple Shared Shaping Algorithm Overview .................................................89
Simple Shared Shaper Algorithm Calculations .........................................90
Variables of the Simple Shared Shaper Algorithm ..........................................91
Guidelines for Controlling the Simple Shared Shaper Algorithm ....................93
Configuring Simple Shared Shaper Algorithm Variables ................................93
Sample Process for Controlling the Simple Shared Shaper Algorithm ............95
Chapter 12 Configuring Compound Shared Shaping of Traffic 99
Compound Shared Shaping Overview ...........................................................99
Supported Hardware for Compound Shared Shaping ..............................99
Bandwidth Allocation for Compound Shared Shaping ...........................100
Configuring Compound Shared Shaping ......................................................100
Example: Compound Shared Shaping for ATM VCs .....................................102
Example: Compound Shared Shaping for ATM VPs .....................................104
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Chapter 13 Configuring Implicit and Explicit Constituent Selection for
Shaping 107
Constituent Selection for Shared Shaping Overview ....................................107
Types of Shared Shaper Constituents ....................................................108
Implicit Constituent Selection Overview ......................................................109
Implicit Bandwidth Allocation for Compound Shared Shaping ..............111
Weighted Compound Shared Shaping Example ..............................113
Configuring Implicit Constituents for Simple or Compound Shared
Shaping .................................................................................................114
Explicit Constituent Selection Overview ......................................................115
Explicit Shared Shaping Example ..........................................................116
Explicit Weighted Compound Shared Shaping Example .......................117
Configuring Explicit Constituents for Simple or Compound Shared
Shaping .................................................................................................120
Table of Contents
Chapter 14 Monitoring a QoS Scheduler Hierarchy 123
Monitoring QoS Scheduling and Shaping .....................................................123
Part 4 Creating a QoS Scheduler Hierarchy on an Interface with
QoS Profiles
Chapter 15 QoS Profile Overview 127
QoS Profile Overview ..................................................................................127
Managing System Resources for Nodes and Queues ....................................127
Scaling Subscribers on the TFA ASIC with QoS ............................................128
Chapter 16 Configuring and Attaching QoS Profiles to an Interface 131
Supported Interface Types for QoS Profiles .................................................131
Configuring a QoS Profile ............................................................................132
Attaching a QoS Profile to an Interface ........................................................134
Attaching a QoS Profile to a Base Interface ...........................................134
Attaching a QoS Profile to an ATM VP ...................................................134
Attaching a QoS Profile to an S-VLAN ...................................................135
Attaching a QoS Profile to a Port Type ..................................................135
Munged QoS Profile Overview .....................................................................136
Sample Munged QoS Profile Process .....................................................137
Example: Port-Type QoS Profile Attachment ...............................................139
Example: QoS Profile Attachment to Port ....................................................141
Example: Diffserv Configuration with Multiple Traffic-Class Groups ............143
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JUNOSe 11.1.x Quality of Service Configuration Guide
Chapter 17 Configuring Shadow Nodes for Queue Management 149
Shadow Node Overview ..............................................................................149
Shadow Nodes and Scheduler Behavior .......................................................150
Managing System Resources for Shadow Nodes ..........................................151
Configuring Shadow Nodes .........................................................................152
Example: Shadow Nodes over VLAN and IP Queues ....................................153
Example: Shadow Nodes on the Same Traffic-Class Group ..........................154
Example: Shadow Nodes on Different Traffic-Class Groups .........................154
Chapter 18 Monitoring a Scheduler Hierarchy on an Interface with QoS
Profiles 155
Monitoring a Scheduler Hierarchy on an Interface with QoS Profiles ...........155
Part 5 Interface Solutions for QoS
Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM 159
ATM Integrated Scheduler Overview ...........................................................159
Backpressure and the Integrated Scheduler ..........................................160
VP Shaping ...........................................................................................161
Integrating the HRR Scheduler and SAR Scheduler ......................................161
Per-Packet Queuing on the SAR Scheduler Overview ..................................163
Operational QoS Shaping Mode for ATM Interfaces Overview ..............164
ERX7xx Models, ERX14xx Models, and the ERX310 Router ...........164
E120 Router and E320 Router ........................................................165
Guidelines for Configuring QoS over ATM ...................................................166
Configuring Default Integrated Mode for ATM Interface ..............................168
Configuring Low-Latency Mode for Per-Port Queuing on ATM Interfaces ....169
Configuring Low-CDV Mode for Per-Port Queuing on ATM Interfaces ..........171
Configuring the QoS Shaping Mode for ATM Interfaces ...............................174
Disabling Per-Port Queuing on ATM Interfaces ............................................175
Monitoring QoS Configurations for ATM ......................................................175
Chapter 20 Configuring QoS for Gigabit Ethernet Interfaces and VLAN
Subinterfaces 177
Providing QoS for Ethernet Overview ..........................................................177
QoS Shaping Mode for Ethernet Interfaces Overview ..................................178
Configuring the QoS Shaping Mode for Ethernet Interfaces .........................179
Creating a QoS Interface Hierarchy for Bulk-Configured VLAN Subinterfaces
Monitoring QoS Configurations for Ethernet ................................................182
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with RADIUS .........................................................................................180
Table of Contents
Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups 183
QoS for 802.3ad Link Aggregation Interfaces Overview ..............................183
Types of Load Balancing .......................................................................183
Munged QoS Profiles and Load Balancing .............................................184
802.3ad Link Aggregation and QoS Parameters ....................................184
QoS and Ethernet Link Redundancy .....................................................185
Active Link Failure and QoS ...........................................................185
Administratively Disabling a Link and QoS .....................................185
Adding a New Link to the LAG and QoS .........................................185
Hashed Load Balancing for 802.3ad Link Aggregation Groups Overview .....186
Sample Scheduler Hierarchy for Hashed Load Balancing ......................186
Subscriber Load Balancing for 802.3ad Link Aggregation Groups
Overview ..............................................................................................186
S-VLANs and Subscriber Load Balancing ...............................................187
PPPoE over VLANs and Subscriber Load Balancing ...............................187
PPPoE over Ethernet (No VLANs) and Subscriber Load Balancing .........187
MPLS over LAG and Subscriber Load Balancing ....................................187
Sample Scheduler Hierarchy for Subscriber Load Balancing ..................188
Subscriber Allocation in 802.3ad Link Aggregation Groups ...................189
Guidelines for Configuring QoS over 802.3ad Link Aggregation Groups ......190
Configuring the Scheduler Hierarchy for Hashed Load Balancing in 802.3ad
Link Aggregation Groups .......................................................................191
Enabling Default Subscriber Load Balancing for 802.3ad Link Aggregation
Groups ..................................................................................................191
Configuring the Scheduler Hierarchy for Subscriber Load Balancing in 802.3ad
Link Aggregation Groups .......................................................................192
Configuring Load Rebalancing for 802.3ad Link Aggregation Groups ..........193
Configuring Load–Rebalancing Parameters ...........................................193
Configuring the System to Dynamically Rebalance the LAG ..................195
Monitoring QoS Configurations for 802.3ad Link Aggregation Groups .........195
Chapter 22 Configuring QoS for L2TP Sessions 197
Providing QoS for L2TP Overview ...............................................................197
Sample Scheduler Hierarchies for L2TP .......................................................197
Configuring QoS for an L2TP Session ..........................................................199
Configuring QoS for Tunnel-Server Ports for L2TP LNS Sessions .................202
QoS and L2TP TX Speed AVP 24 Overview .................................................203
Monitoring QoS Configurations for L2TP .....................................................204
Configuring QoS for an L2TP LNS Session .............................................200
Configuring QoS for an L2TP LAC Session ............................................201
Logical Interfaces and Shared-Shaping Rates ........................................203
Shaping Mode .......................................................................................204
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Chapter 23 Configuring Interface Sets for QoS 207
Interface Sets for QoS Overview ..................................................................207
Interface Set Terms ...............................................................................207
Architecture of Interface Sets for QoS .........................................................208
Interface Set Parents and Types ............................................................209
Sample Interface Columns and Scheduler Hierarchies ..........................209
Scheduling and Shaping Interface Sets ..................................................210
Configuring Interface Sets for Scheduling and Queuing ...............................211
Configuring Interface Supersets for QoS ......................................................212
Configuring an Interface Superset .........................................................212
Restricting an Interface Superset to an S-VLAN ID or an ATM VP ..........212
Configuring Interface Sets for QoS ..............................................................213
Configuring an Interface Set .................................................................213
Deleting an Interface Set from an Interface Superset ............................213
Adding Member Interfaces to an Interface Set .............................................214
Adding Interfaces to an Interface Set with the CLI ................................214
Adding Interfaces to an Interface Set with RADIUS ...............................215
Changing and Deleting Interface Members in an Interface Set ..............215
Changing Interface Members with Upper-Layer Protocols in an Interface
Set ..................................................................................................215
Creating a QoS Parameter on an Interface Superset or Interface Set ...........216
Configuring a QoS Parameter Definition for an Interface Superset or an
Interface Set ...................................................................................216
Creating a QoS Parameter Instance for an Interface Superset ...............217
Creating a QoS Parameter Instance for an Interface Set ........................217
Attaching a QoS Profile to an Interface Superset or an Interface Set ............218
Configuring a QoS Profile for an Interface Superset or an Interface
Set ..................................................................................................218
Attaching a QoS Profile to an Interface Superset ...................................218
Attaching a QoS Profile to an Interface Set ...........................................219
Deleting an Interface Superset or an Interface Set .......................................219
Deleting an Interface Superset ..............................................................219
Deleting an Interface Set .......................................................................220
Example: Configuring Interface Sets for 802.3ad Link Aggregation
Groups ..................................................................................................220
Part 6 Managing Queuing and Scheduling with QoS Parameters
Chapter 24 QoS Parameter Overview 225
QoS Parameter Overview ............................................................................225
QoS Parameter Audience ............................................................................225
QoS Parameter Terms .................................................................................226
xvi ■ Table of Contents
Table of Contents
Relationship Among QoS Parameters, Scheduler Profiles, and QoS
Profiles .................................................................................................227
QoS Administrator Tasks ......................................................................227
QoS Client Tasks ...................................................................................228
Chapter 25 Configuring a QoS Parameter 229
Parameter Definition Attributes for QoS Administrators Overview ..............229
Naming Guidelines for QoS Parameters ................................................230
Interface Types and QoS Parameters ....................................................231
Controlled-Interface Types .............................................................231
Instance-Interface Types ................................................................232
Subscriber-Interface Types .............................................................233
Range of QoS Parameters .....................................................................234
Applications and QoS Parameters .........................................................235
Scheduler Profiles and Parameter Expressions for QoS Administrators .......235
Referencing a Parameter Definition in a Scheduler Profile ....................235
Removing or Modifying a Scheduler Profile ....................................236
Using Expressions for QoS Parameters .................................................236
Operators and Precedence .............................................................236
Specifying a Range in Expressions .................................................237
Configuring a Basic Parameter Definition for QoS Administrators ...............238
Parameter Instances for QoS Clients Overview ...........................................240
Global QoS Parameter Instance Overview .............................................240
QoS Parameters for Interfaces Overview ..............................................241
Creating Parameter Instances ......................................................................242
Creating a Global Parameter Instance ...................................................242
Creating a Parameter Instance for an Interface .....................................242
Creating a Parameter Instance for an ATM VP ......................................242
Creating a Parameter Instance for an S-VLAN .......................................243
Example: QoS Parameter Configuration for Controlling Subscriber
Bandwidth ............................................................................................243
Procedure for QoS Administrators ........................................................245
Procedure for QoS Clients .....................................................................250
Monitoring the Subscriber Configuration ..............................................252
Complete Configuration Example .........................................................256
QoS Administrator Configuration ...................................................256
QoS Client Configuration ................................................................258
Chapter 26 Configuring Hierarchical QoS Parameters 261
Hierarchical QoS Parameters Overview .......................................................261
Guidelines for Configuring Hierarchical Parameters ....................................261
Configuring a Parameter Definition to Calculate Hierarchical Instances ......262
Example: QoS Parameter Configuration for Hierarchical Parameters ..........263
Procedure for QoS Administrators ........................................................264
Procedure for QoS Clients .....................................................................265
Monitoring Hierarchical QoS Parameters ..............................................266
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Complete Configuration Example .........................................................267
QoS Administrator Configuration ...................................................267
QoS Client Configuration ................................................................267
Chapter 27 Configuring IP Multicast Bandwidth Adjustment with QoS
Parameters 269
IP Multicast Bandwidth Adjustment for QoS Overview ................................269
Guidelines for Configuring IP Multicast Adjustment for QoS ........................271
Configuring a Parameter Definition for IP Multicast Bandwidth
Adjustment ...........................................................................................271
Example: QoS Parameter Configuration for IP Multicast Bandwidth
Adjustment ...........................................................................................273
Monitoring the Configuration ................................................................276
Complete Configuration Example .........................................................279
Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters 281
Cell Shaping Mode Using QoS Parameters Overview ...................................281
Overriding the QoS Shaping Mode ........................................................281
Module Types and Capabilities for QoS Cell Mode Application ..............282
Cell Tax Adjustment Using QoS Cell Mode ............................................282
Relationship with QoS Downstream Rate Application ...........................283
Guidelines for Configuring the Cell Shaping Mode with QoS Parameters .....283
Configuring a Parameter Definition to Shape Ethernet Traffic Using Cell
Mode ....................................................................................................284
Example: QoS Parameter Configuration for QoS Cell Mode and Byte
Adjustment for Cell Shaping ..................................................................286
Complete Configuration Example .........................................................290
Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS
Parameters 293
Byte Adjustment for ADSL and VDSL Traffic Overview ................................293
Byte Adjustment for Cell Shaping of ADSL Traffic Overview .................293
Calculation and Example of Byte Adjustment for Cell Shaping .......294
Byte Adjustment for Frame Shaping of VDSL Traffic Overview .............295
System Calculation for Byte Adjustment of ADSL and VDSL Traffic ......295
Guidelines for Configuring Byte Adjustment of Cell and Frame Shaping Rates
Using QoS Parameters ..........................................................................296
Configuring a Parameter Definition to Adjust Cell Shaping Rates for ADSL
Traffic ...................................................................................................297
Configuring a Parameter Definition to Adjust Frame Shaping Rates for VDSL
Traffic ...................................................................................................299
xviii ■ Table of Contents
Table of Contents
Chapter 30 Configuring the Downstream Rate Using QoS Parameters 301
QoS Downstream Rate Application Overview ..............................................301
Downstream Rate and the Shaping Mode .............................................301
QoS Adaptive Mode and Downstream Rate ..........................................302
Obtaining Downstream Rates from a DSL Forum VSA ..........................302
Guidelines for Configuring QoS Downstream Rate ......................................303
Configuring a Parameter Definition for QoS Downstream Rate ...................303
Example: QoS Parameter Configuration for QoS Downstream Rate ............305
Complete Configuration Example .........................................................309
Part 7 Monitoring and Troubleshooting QoS
Chapter 31 Monitoring QoS on E Series Routers 313
Monitoring Service Levels with Traffic Classes .............................................314
Monitoring Service Levels with Traffic-Class Groups ....................................315
Monitoring Queue Thresholds .....................................................................316
Monitoring Queue Profiles ...........................................................................319
Monitoring Drop Profiles for RED and WRED ..............................................320
Monitoring the QoS Scheduler Hierarchy .....................................................322
Monitoring the Configuration of Scheduler Profiles .....................................327
Monitoring Shared Shapers .........................................................................329
Monitoring Shared Shaper Algorithm Variables ...........................................330
Monitoring Forwarding and Drop Events on the Egress Queue ...................331
Monitoring Forwarding and Drop Rates on the Egress Queue .....................333
Monitoring Queue Statistics for the Fabric ...................................................337
Monitoring the Configuration of Statistics Profiles .......................................338
Monitoring the QoS Profiles Attached to an Interface ..................................339
Monitoring the Configuration of QoS Port-Type Profiles ..............................340
Monitoring the Configuration of QoS Profiles ..............................................341
Monitoring the QoS Configuration of ATM Interfaces ..................................343
Monitoring the QoS Configuration of IP Interfaces ......................................345
Monitoring the QoS Configuration of Fast Ethernet, Gigabit Ethernet, and
10-Gigabit Ethernet Interfaces ...............................................................347
Monitoring the QoS Configuration of IEEE 802.3ad Link Aggregation Group
Bundles .................................................................................................349
Monitoring the Configuration of QoS Interface Sets .....................................350
Monitoring the Configuration of QoS Interface Supersets ............................351
Monitoring the AAA Downstream Rate for QoS ...........................................352
Monitoring QoS Parameter Instances ..........................................................352
Monitoring QoS Parameter Definitions ........................................................355
Table of Contents ■ xix
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Chapter 32 Troubleshooting QoS 357
Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics
and Events ............................................................................................357
Part 8 Index
Index ...........................................................................................................361
xx ■ Table of Contents
List of Figures
Part 1 QoS on the E Series Router
Chapter 1 Quality of Service Overview 3
Figure 1: Traffic Flow Through an E Series Router ...........................................4
Part 2 Classifying, Queuing, and Dropping Traffic
Chapter 4 Configuring Dropping Behavior with RED and WRED 25
Figure 2: Packets Dropped as Queue Length Increases ..................................27
Figure 3: Color-Blind RED Drop Profile with Colorless Queue Profile .............30
Figure 4: Color-Blind RED Drop Profile with Color-Sensitive Queue
Profile .....................................................................................................30
Figure 5: Different Treatment of Colored Packets ..........................................33
Figure 6: Defining Different Drop Behavior for Each Queue ..........................34
Figure 7: WRED and Dynamic Queue Thresholding ......................................36
Part 3 Scheduling and Shaping Traffic
Chapter 6 QoS Scheduler Hierarchy Overview 45
Figure 8: QoS Scheduler Hierarchy ................................................................46
Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy 51
Figure 9: Port Shaping on an Ethernet Module ..............................................52
Figure 10: Hierarchical Assured Rate .............................................................55
Chapter 8 Configuring Strict-Priority Scheduling 59
Figure 11: Sample Strict-Priority Scheduling Hierarchy ..................................60
Figure 12: True Strict-Priority Configuration ..................................................62
Figure 13: Relative Strict-Priority Configuration .............................................63
Figure 14: Tuning Latency on Strict-Priority Queues ......................................66
Figure 15: Sample Strict-Priority Scheduling Hierarchy ..................................67
Figure 16: Sample Relative Strict-Priority Scheduler Hierarchy ......................69
Chapter 9 Shared Shaping Overview 71
Figure 17: Implicit Constituent Selection for Compound Shared Shaper: Mixed
Interface Types .......................................................................................76
Chapter 10 Configuring Simple Shared Shaping of Traffic 79
Figure 18: Simple Shared Shaping over ATM .................................................80
Figure 19: Simple Shared Shaping over Ethernet ...........................................81
Figure 20: VP Shared Shaping .......................................................................85
Figure 21: Hierarchical Simple Shared Shaping over Ethernet .......................86
Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm 89
Figure 22: Simple Shared Shaper Behavior Without Algorithm Controls ........89
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JUNOSe 11.1.x Quality of Service Configuration Guide
Figure 23: Less Conservative Simple Shared Shaper Behavior .......................90
Figure 24: More Liberal Simple Shared Shaper Behavior ...............................90
Figure 25: Dynamic Rate When Video Flow Starts ........................................96
Figure 26: Dynamic Rate When Video Flow Stops .........................................97
Chapter 12 Configuring Compound Shared Shaping of Traffic 99
Figure 27: VC Compound Shared Shaping Example ....................................102
Figure 28: VP Compound Shared Shaping Example ....................................105
Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping 107
Figure 29: Implicit Constituent Selection for Compound Shared Shaper at
Best-Effort Node ....................................................................................110
Figure 30: Implicit Constituent Selection for Compound Shared Shaper at
Best-Effort Queue ..................................................................................111
Figure 31: Weighted Shared Shaping ...........................................................113
Figure 32: Implicit Constituent Selection for Compound Shared Shaper: Mixed
Interface Types .....................................................................................114
Figure 33: Explicit Constituent Selection .....................................................117
Figure 34: Case 1: Explicit Constituent Selection with Weighted
Constituents ..........................................................................................118
Figure 35: Case 2: Explicit Constituent Selection with Weighted
Constituents ..........................................................................................119
Part 4 Creating a QoS Scheduler Hierarchy on an Interface with
QoS Profiles
Chapter 16 Configuring and Attaching QoS Profiles to an Interface 131
Figure 36: Munged Profile Example .............................................................138
Figure 37: Attaching QoS Profiles to ATM Subinterfaces ..............................139
Figure 38: Attaching QoS Profile to ATM Interface and Subinterface ...........142
Figure 39: Diffserv Configuration with Multiple Traffic-Class Groups ...........146
Figure 40: Diffserv Configuration Without Traffic-Class Groups ...................147
Chapter 17 Configuring Shadow Nodes for Queue Management 149
Figure 41: Phantom Nodes ..........................................................................150
Figure 42: Shadow Nodes ............................................................................151
Part 5 Interface Solutions for QoS
Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM 159
Figure 43: Integrated ATM Scheduler ..........................................................161
Figure 44: Default Integrated Mode .............................................................168
Figure 45: Low-Latency Mode ......................................................................170
Figure 46: Low-CDV Mode (per-VP CDVT) ...................................................172
Figure 47: Low-CDV Mode (per-VC CDVT) ...................................................172
Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups 183
Figure 48: 802.3ad Link Aggregation Scheduler Hierarchy ..........................186
Figure 49: Subscriber LoadBalanced Scheduler Hierarchy for Port 0 ...........188
Figure 50: Subscriber LoadBalanced Scheduler Hierarchy for Port 1 ...........189
Figure 51: Subscriber Allocation and Load Balancing ..................................189
Chapter 22 Configuring QoS for L2TP Sessions 197
xxii ■ List of Figures
List of Figures
Figure 52: LNS (Non-MLPPP) Scheduler Hierarchy .......................................198
Figure 53: LNS (MLPPP) QoS Scheduler Hierarchy .......................................198
Figure 54: LAC over Ethernet (Without VLANs) Scheduler Hierarchy ...........198
Figure 55: LAC over Ethernet (With LANs) Scheduler Hierarchy ..................199
Figure 56: LAC over ATM ............................................................................199
Chapter 23 Configuring Interface Sets for QoS 207
Figure 57: VLAN Interface Column with Interface Sets ................................210
Figure 58: Scheduler Hierarchy with Nodes at Interface Set and Superset ....210
Part 6 Managing Queuing and Scheduling with QoS Parameters
Chapter 24 QoS Parameter Overview 225
Figure 59: Relationship of Parameter Definitions, Scheduler Profiles, and
QoS Profiles ..........................................................................................227
Chapter 25 Configuring a QoS Parameter 229
Figure 60: Physical Network Topology ........................................................244
Figure 61: QoS Scheduler Hierarchy ............................................................244
Chapter 26 Configuring Hierarchical QoS Parameters 261
Figure 62: Hierarchical Parameters Scheduler Hierarchy .............................264
Chapter 27 Configuring IP Multicast Bandwidth Adjustment with QoS Parameters 269
Figure 63: Scheduler Hierarchy with QoS Adjustment for IP Multicast .........274
Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters 281
Figure 64: Byte Adjustment for VC1 and VC2 ..............................................286
Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS Parameters 293
Figure 65: Byte Adjustment Calculation for Ethernet and ATM
Encapsulations ......................................................................................294
List of Figures ■ xxiii
JUNOSe 11.1.x Quality of Service Configuration Guide
xxiv ■ List of Figures
List of Tables
About the Documentation xxix
Table 1: Notice Icons ...................................................................................xxx
Table 2: Text and Syntax Conventions ........................................................xxx
Part 1 QoS on the E Series Router
Chapter 1 Quality of Service Overview 3
Table 3: QoS Terminology ...............................................................................5
Table 4: QoS Features .....................................................................................7
Part 2 Classifying, Queuing, and Dropping Traffic
Chapter 3 Configuring Queue Profiles for Buffer Management 17
Table 5: Egress Memory and Region Size on ASIC Line Modules ...................19
Part 3 Scheduling and Shaping Traffic
Chapter 9 Shared Shaping Overview 71
Table 6: Shared Shaper Terminology Used in This Chapter ...........................72
Table 7: Comparison of Simple and Compound Shared Shaping ...................73
Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm 89
Table 8: Guidelines for Configuring Simple Shared Shaper Algorithm
Variables .................................................................................................93
Table 9: Rising Edge Sample When Video Flow Starts ...................................95
Table 10: Data When Video Flow Stops .........................................................96
Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping 107
Table 11: Comparison of Implicit and Explicit Shared Shaping ....................108
Table 12: Bandwidth Allocation for Case 1 Explicit Constituents .................118
Table 13: Bandwidth Allocation for Case 2 Explicit Constituents .................119
Part 4 Creating a QoS Scheduler Hierarchy on an Interface with
QoS Profiles
Chapter 16 Configuring and Attaching QoS Profiles to an Interface 131
Table 14: Interface Types and Supported Commands .................................131
Chapter 17 Configuring Shadow Nodes for Queue Management 149
Table 15: Shadow Node Consumption of Node and Queue Resources .........152
List of Tables ■ xxv
JUNOSe 11.1.x Quality of Service Configuration Guide
Part 5 Interface Solutions for QoS
Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM 159
Table 16: qos-mode-port Commands ..........................................................162
Table 17: Operational Shaping Modes for ERX7xx Models, ERX14xx Models,
and the ERX310 Router ........................................................................165
Table 18: Operational Shaping Modes for the E120 Router and E320
Router ...................................................................................................166
Chapter 20 Configuring QoS for Gigabit Ethernet Interfaces and VLAN Subinterfaces 177
Table 19: Operational Shaping Modes .........................................................178
Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups 183
Table 20: Load Balancing Algorithm Parameters .........................................193
Chapter 23 Configuring Interface Sets for QoS 207
Table 21: Interface Set Terms ......................................................................208
Part 6 Managing Queuing and Scheduling with QoS Parameters
Chapter 24 QoS Parameter Overview 225
Table 22: QoS Parameter Terminology Used in This Chapter ......................226
Chapter 25 Configuring a QoS Parameter 229
Table 23: Attributes in Parameter Definitions ..............................................229
Table 24: Sample Parameter Names ...........................................................230
Table 25: Valid and Invalid Parameter Names .............................................231
Table 26: Operators for Parameter Expressions ..........................................237
Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters 281
Table 27: Supported Interfaces for qos-shaping-mode and qos-cell-mode
Commands ...........................................................................................282
Table 28: Byte Adjustment for Subscribers VC1 and VC2 ............................286
Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS Parameters 293
Table 29: Header Lengths for Ethernet Encapsulation .................................294
Table 30: Header Lengths for ATM Encapsulation .......................................295
Table 31: Byte Adjustment Values for Frame and Cell Shaping Modes ........296
Chapter 30 Configuring the Downstream Rate Using QoS Parameters 301
Table 32: Access Loop Types and Resultant Shaping Mode .........................302
Table 33: Shaping Rate and Shaping Mode ..................................................306
Part 7 Monitoring and Troubleshooting QoS
Chapter 31 Monitoring QoS on E Series Routers 313
Table 34: show traffic-class Output Fields ...................................................314
Table 35: show traffic-class-group Output Fields .........................................315
Table 36: show qos queue-thresholds Output Fields ....................................319
Table 37: show queue-profile Output Fields .................................................320
Table 38: show drop-profile Output Fields ...................................................321
Table 39: show qos scheduler-hierarchy Output Fields ................................327
Table 40: show scheduler-profile Output Fields ...........................................328
Table 41: show qos shared-shaper Output Fields .........................................330
Table 42: show qos shared-shaper-control Output Fields .............................331
xxvi ■ List of Tables
List of Tables
Table 43: show egress-queue events Output Fields ......................................332
Table 44: show egress-queue rates Output Fields ........................................335
Table 45: show fabric-queue Output Fields ..................................................337
Table 46: show statistics-profile Output Fields .............................................338
Table 47: show qos interface-hierarchy Output Fields .................................339
Table 48: show qos-profile Output Fields .....................................................342
Table 49: show interfaces atm Output Fields ...............................................344
Table 50: show ip interface Output Fields ...................................................346
Table 51: show interfaces Output Fields ......................................................348
Table 52: show interfaces lag members Output Fields .................................349
Table 53: show qos-interface-set Output Fields ...........................................350
Table 54: show qos-interface-superset Output Fields ...................................351
Table 55: show aaa qos downstream-rate Output Fields ..............................352
Table 56: show qos-parameter Output Fields ..............................................354
Table 57: show qos-parameter-define Output Fields ....................................355
List of Tables ■ xxvii
JUNOSe 11.1.x Quality of Service Configuration Guide
xxviii ■ List of Tables
About the Documentation
■ E Series and JUNOSe Documentation and Release Notes on page xxix
■ Audience on page xxix
■ E Series and JUNOSe Text and Syntax Conventions on page xxix
■ Obtaining Documentation on page xxxi
■ Documentation Feedback on page xxxi
■ Requesting Technical Support on page xxxi
E Series and JUNOSe Documentation and Release Notes
For a list of related JUNOSe documentation, see
http://www.juniper.net/techpubs/software/index.html .
If the information in the latest release notes differs from the information in the
documentation, follow the JUNOSe Release Notes.
To obtain the most current version of all Juniper Networks® technical documentation,
see the product documentation page on the Juniper Networks website at
http://www.juniper.net/techpubs/.
Audience
This guide is intended for experienced system and network specialists working with
Juniper Networks E Series Broadband Services Routers in an Internet access
environment.
E Series and JUNOSe Text and Syntax Conventions
Table 1 on page xxx defines notice icons used in this documentation.
E Series and JUNOSe Documentation and Release Notes ■ xxix
JUNOSe 11.1.x Quality of Service Configuration Guide
Table 1: Notice Icons
Table 2 on page xxx defines text and syntax conventions that we use throughout the
E Series and JUNOSe documentation.
DescriptionMeaningIcon
Indicates important features or instructions.Informational note
Indicates a situation that might result in loss of data or hardware damage.Caution
Alerts you to the risk of personal injury or death.Warning
Alerts you to the risk of personal injury from a laser.Laser warning
Table 2: Text and Syntax Conventions
Represents commands and keywords in text.Bold text like this
Bold text like this
Fixed-width text like this
Represents text that the user must type.
Represents information as displayed on your
terminal’s screen.
Italic text like this
Emphasizes words.
■
Identifies variables.
■
Identifies chapter, appendix, and book
■
names.
Plus sign (+) linking key names
keys simultaneously.
Syntax Conventions in the Command Reference Guide
ExamplesDescriptionConvention
Issue the clock source command.
■
Specify the keyword exp-msg.
■
host1(config)#traffic class low-loss1
host1#show ip ospf 2
Routing Process OSPF 2 with Router
ID 5.5.0.250
Router is an Area Border Router
(ABR)
There are two levels of access: user and
■
privileged.
clusterId, ipAddress.
■
Appendix A, System Specifications
■
Press Ctrl + b.Indicates that you must press two or more
terminal lengthRepresents keywords.Plain text like this
| (pipe symbol)
xxx ■ E Series and JUNOSe Text and Syntax Conventions
mask, accessListNameRepresents variables.Italic text like this
diagnostic | lineRepresents a choice to select one keyword
or variable to the left or to the right of this
symbol. (The keyword or variable can be
either optional or required.)
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